【My mother always says it's a waste of money】

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My mother always says it's a waste of money ____such things as are not really needed when I buy some new CDs.
A.buy B.to buy C.buying Dbought
选C固定词组 waste time doing sth只能用动名词
======以下答案可供参考======
供参考答案1:
选C waste time doing sth是一个固定搭配，表示“浪费时间做某事”，后面接动名词来做补语，就像spend time doing sth一样，这样的固定搭配一定要记住哦，这样下回碰到就很容易做了。
供参考答案2:
waste of （sth） doing sth,固定词组，of是介词，后面的动词要用ing的形式，译为：浪费。。做某事。
供参考答案3:
c